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    <title>Title</title>
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<ul>响应头
    <li>Accept-Ranges: bytes //返回值为 bytes，这代表了该服务器可以接受范围请求，这样我们就可以做断点下载的功能了。如果该值为 none，则代表不允许范围请求</li>
    <li>Connection: Keep-Alive</li>
    <li>Content-Encoding: gzip //压缩编码类型</li>
    <li>Content-Length: 984</li>
    <li>Content-Type: image/x-icon//服务端发送的类型及采用的编码方式</li>
    <li>Date: Tue, 18 Feb 2020 06:45:03 GMT//客户端请求服务端的时间</li>
    <li>Etag: "423e-55c8139094a40"</li>
    <li>Last-Modified: Fri, 27 Oct 2017 06:16:01 GMT//服务端对该资源最后修改的时间</li>
    <li>Server: Apache//服务端的Web服务端名</li>
    <li>Vary: Accept-Encoding,User-Agent</li>
</ul>
<ul>请求头
    <li>Accept: image/webp,image/apng,image/*,*/*;q=0.8//客户端能接收的资源类型</li>
    <li>Accept-Encoding: gzip, deflate, br//(客户端能接收的压缩数据的类型)</li>
    <li>Accept-Language: zh-CN,zh;q=0.9//客户端接收的语言类型</li>
    <li>Cache-Control: no-cache//服务端禁止客户端缓存页面数据</li>
    <li>Connection: keep-alive//维护客户端和服务端的连接关系</li>
    <li>Cookie: BIDUPSID=DBC3B1F57DD14F30AB725B0EBD7F9D58; PSTM=1578980840; BAIDUID=DBC3B1F57DD14F30A9DAD66E2E871894:FG=1; BD_UPN=123253; sugstore=1; BDORZ=B490B5EBF6F3CD402E515D22BCDA1598; H_PS_PSSID=1423_21113; delPer=0; BD_CK_SAM=1; PSINO=6; BD_HOME=0; BDSVRTM=0//客户端暂存服务端的信息</li>
    <li>Host: www.baidu.com//连接的目标主机和端口号</li>
    <li>Pragma: no-cache//服务端禁止客户端缓存页面数据</li>
    <li>Referer: https://www.baidu.com/img/PCpad_bc531b595cf1e37c3907d14b69e3a2dd.png//来于哪里 源于</li>
    <li>Sec-Fetch-Dest: image</li>
    <li>Sec-Fetch-Mode: no-cors</li>
    <li>Sec-Fetch-Site: same-origin</li>
    <li>User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.106 Safari/537.36//客户端版本号的名字</li>
</ul>
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